A design-build package was prepared to repair the levee, spillway, and associated structures by developing construction documents, specifications, and cost estimates for the contractor. Kenall engineers conducted a thorough evaluation of the area’s flood conditions, completed levee inspections, and certified the levee for a 100-year flood event according to 44 CFR §65.10. They designed a new spillway measuring 30-ft wide and 300-ft long, incorporating services across hydrology and hydraulics, survey, geophysical, geotechnical, civil, and structural engineering disciplines.

Kenall’s proposed design recommended using Articulated Concrete Blocks to line the spillway top and installing sheet piles to an elevation of –19.50 ft, matching the spillway’s elevation. The levee and spillway recommendations rebuilt and reinforced the structures to ensure safe access for public use and utility infrastructure needs. Recreational amenities, including fishing platforms, a concrete boat ramp, and boardwalk, were also restored.

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With emergency funding approved in August 2018, Kenall acted swiftly, submitting a design proposal within two days of the request, which included a site visit. Following the notice to proceed on September 5th, Kenall completed the necessary surveys, topographic assessments, hydraulic modeling, and design work for the new roadway, culvert, and guardrails by October 15th, delivering all bid documents to the US Fish and Wildlife Service (USFWS) on time.

The project focused on replacing the structurally inadequate culvert under CR 417 with a 60-foot-long, 60-inch diameter reinforced concrete pipe. Advanced hydraulic models—HEC-HMS, HEC-RAS, and HY-8—were employed using data from surveys, LiDAR, and geotechnical studies. These models guided the design to optimize the culvert’s capacity, cover depth, and performance under hydraulic pressure. Erosion protection and regrading measures were implemented for the downstream channel to ensure effective floodwater management within its banks.

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Final grades were adjusted to align with the surrounding terrain, with a focus on facilitating floodwater management and ensuring safe downstream passage, while retaining portions of the bridge as part of the trail. Key deliverables from Kenall included design drawings, specifications, engineering considerations and instructions for field personnel (ECIFP), a detailed design review (DDR), and cost estimates.

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Package 1 involved the extension of the Colorado River Levee, including three miles of earthen levee and one mile of floodwall. It incorporated crucial features such as the Black-Collins sump areas, Polk Street storm drainage improvements and pavement, closure structures, and a one-mile road elevation for FM102. Grading and slope protection for the Colorado Riverbanks near the sluices were designed, supplemented with rock riprap to control erosion. Post-construction seeding and erosion control measures were detailed as part of the package.

Package 2 focused on the Railroad Levee, Baughman Slough Levee, and floodwall design, alongside culverts and a significant widening of the channel bottom from 50 to 125 feet over a four-mile stretch. This package also included the design of three replacement bridges: the Moers Lane Bridge and Fulton Street Bridge, built as multi-span concrete structures on drilled piers, with spans of 175 feet and 204 feet, respectively. Efforts were made to optimize drainage and minimize erosion impacts on the channel slopes.

Kenall developed AutoCAD Civil 3D drawings at progressive stages—30%, 60%, 90%, and 100%—and provided detailed technical specifications. The floodwall design adhered to stringent engineering standards (EM 1110-2-2000, EM 1110-2-2100, EM1110-2-2502, and EM 1110-2-2906), ensuring compliance. These designs improved flood risk management for the City of Wharton.

Work performed on these projects was completed under the Kenall-Freese & Nichols 8a Mentor-Protégé Joint Venture (KFNI JV).

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The project included demolition, new pavement, adjustments to the outbound Active Vehicle Barrier (AVB), and roadway geometry changes. Traffic signals, signs, and pavement markings were upgraded, while guardrails were extended, fences modernized, and stormwater systems enhanced. Completed in accordance with Unified Facilities Criteria and Army Design Criteria, the project addressed issues identified in a 2018 traffic study and improved overall efficiency.

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Major drainage improvements were carried out, including erosion repair, sediment removal, stabilization of disturbed areas, and flood prevention measures for infrastructure. Tasks included installing culverts, headwalls, inlets, trapezoidal channels, and increasing ditch capacities. Stormwater Best Management Practices (BMPs) were implemented, along with the resolution of failures identified during site investigations.

Kenall collaborated with stakeholders through on-site design charrettes and review meetings. Detailed drawings and technical specifications were developed using AutoCAD Civil 3D, ensuring effective coordination.

Work performed on this project was completed under the Kenall-Freese & Nichols 8a Mentor-Protégé Joint Venture (KFNI JV).

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Kenall’s scope of work includes, the overall project management of the task order; inspecting existing storm drain infrastructure; performing paving design and grading design; providing SWWP and demolition plan; verifying existing utilities; leading the development of 65/95/100% Design Data submittals; and cost estimates (MII); and responding to bidder inquires/ RFIs etc.

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Key tasks included repairing erosion, restoring or replacing flumes, adjusting utility vaults and manholes, improving drainage infrastructure, correcting grades, and stabilizing disturbed areas. Kenall managed all aspects of the project, including design development, quality control, site assessments, and adherence to budget and schedule requirements, delivering a thorough DB RFP on behalf of the Corps of Engineers.

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Kenall’s scope of work included project management, development of a design quality control plan, and hydrologic and hydraulic evaluations. Additional tasks involved preparing storm drainage and pollution prevention plans, performing economic analyses (cost-benefit analyses), conducting field investigations for each dam including evaluating the environmental impacts of decommissioning the dams, identifying existing utility characteristics, and estimating construction costs for the proposed options.

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We accomplished surveying, geotechnical investigation, stream bank stabilization, design of plan and profile of the new 42-inch sewer line, outfall rehabilitation plan and details, construction stormwater control plans, environmental mitigation details, permitting, traffic control plans, establishment of temporary construction access points and permanent maintenance access points, construction sequencing, preparation of construction plans and specifications, and bid-phase services.

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